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php session_start有关问题

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Release: 2016-06-13 10:16:20
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php session_start问题
新手求助!!
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at C:\AppServ\www\reg\homepage.php:5) in C:\AppServ\www\reg\homepage.php on line 676
我在网上查了,但解决方案都是改变系统文件之类的,以我以前编c++的经验来看,一般没什么用,果然它真的不起作用。所以,O(∩_∩)O~应该如何解决呢?在此先谢过各位了。。。

------解决方案--------------------
怎么不行啊。这样试试:

PHP code
<?php session_start();  echo '<div id="apDiv2">';  if(isset($_SESSION['username'])){        echo $_SESSION['username'], "welcome!";        echo '<a href="login.php?action=logout">注销</a>';  }else{          echo'<a href="login.html">登陆</a> ';    }  echo '';?><div class="clear">
                 
              
              
        
            </div>
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